Insulator.



J. H. KENDIG.

INSULATOR.

APPLICATION FILED APR-27, 1916.

1,217,131 5. Patented Feb. 27, 1917.

ATTORN EVS.

Uivrrnn STATES PATENT OFFICE.

JULIAN I-I. KENDIG, OF PITTSBURGH, PENN$YLVANIA.

INSULATOR.

Application filed April 2'7, 1916.

To all whom it may concern:

Be it known that I, JULIAN H. Knnnro, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Insulators, of which the following is a specil'ication.

This invention relates to insulators and more particularly to that class of insulators used in supporting electric current conduc tors or wires in buildings and has for its principal objects the provision of an insulator wherein the various parts making up the complete insulator are held in assembled position, the provision of an insulator that may be economically mamifactured the provision of an insulator that is easily packed for shipping and easily applied and to which the wire "may readily be secured, and such other. objects as may hereinafter appear. Certain embodiments of the invention are shown in the accompanying drawings, wherein- Figure 1 is a longitudinal section of the insulator, showing the parts in position to receive the wires, Fig. 2 is a longitudinal section through the insulator showing it applied to the support with the wire in clamped position, Fig. 3 is a transverse section on the line IIIIII of Fig. 1, Fig. d is a longitudinal section of a portion of an insulator showing a modified form of construction; Fig. is a longitudinal section of another modification showing flutes longitudinally disposed upon the fastening member; Fig. 6 is a longitudinal section of a portion of the insulator shown in Fig. 5; Fig. 7 is an enlarged transverse section on the line VIL-VII of Fig. 5, and Fig. 8 is a longitudinal section of a portion of still another modified form of construction.

Referring to the drawings, the insulator comprises a fastening member 1 which may be either a nail or screw provided with a head 2 and a point 3, upon which is slidably mounted a cap a which is provided with a perforation 5 through which the fastening member passes, the head of the fastening member being of such size that it will not pass through the perforation. A suitable cushioning washer 6 is applied to the fastening member between the head and the cap to prevent breakage of the cap when the fastening member is being applied to the support.

Specification of Letters Patent.

Patented Feb. 27, 1917.

Serial No. 93,895.

A base 7, having a perforation 8 extending therethrough, is mounted upon the shank in such a position that the cap '1- may be freely moved longitudinally of the shank of the fastening member and separated from the base member sufficient distance to permit of the insertion of the wire 9 be tween the cap and the base. The cap is provided upon the face adjacent the base with an annular groove, certain portions thereof being adapted to register with the straight grooves 11 in the face of the has adjacent the cap whereby the wire is socurely clamped between the base and cap when the insulator is applied to the support, as shown in Fig. 2.

The base is held in the position shown in Fig. 1 preferably by means of asphalt, gum or some other suitable cement 12 which will adhere both to the fastening member and the base, preferably applied so that the cement contacts with the walls of the perforation as shown in Fig. 1. The purpose of the cement is to hold the base in assembled position on the fastening member so that the parts making up the insulator cannot be separated prior to use, by ordinary handling incident to packing, shipping, marketing and conveying to the place at which they are to be applied.

When the insulator is to be applied, the wire 9 is first inserted in one of the grooves 11 in the face of the base and the cap forced down against the wire. The cap at such time will then be separated from the head of the nail which facilitates the driving of the fastening member whether it be a. screw or a nail. While the parts are thus held the fas tening member is driven into the support 13 and when the base engages the support further movement thereof will be arrested, at which time further driving of the fastening member into the support will cause a rupture of the cement so that relative movement of the fastening member is then pos sible, after which the fastening member may be driven so as to securely bind the cap portion down upon the wire, thereby clamping it securely to the insulator. As illustrated in Fig. 2, the cement 12 is shown to have been fractured from the base and has been stripped up the fastening member by the support as the said member entered it. It is possible that the cement will adhere to the base and its adhesion to the nail ruptured, the manner of rupture being immaterial.

Referring to Fig. 4 a modified means of applying the cement is illustrated, the ocment 12 in this case being applied to the fastening member 1 so that a portion adheres to the bottom 14: of the base 7, thereby holding the base and fastening member temporarily in fixed relation.

Referring to Figs. 5, 6 and 7, a: modified form of fastening member is illustrated, wherein the shank l is provided intermediate the point and the head, with longitudinal flutes which form sharp edged ridges 15 which project beyond the normal surface of the fastening member and which score into the porcelain as the fastening member is forced through the perforation S and serve to firmly wedge the fastening member into temporary fixed relation with the base 7 l/Vhen this form of insulator is appliec in position upon a support 18, the fastening member will move with respect to the base when the base contacts with the support, in a manner similar to the operation previously described, but in this case the holding means, viz., the sharp ridges 15 will enter the support as shown in Fi 6, and serve to prevent the fastening member from working loose from the support.

Another modification of the fastening member is illustrated in Fig. 8 wherein the fastening member 1 is provided with ya knurled surface 16 having minute points or teeth projecting above the surface of the fastening member for the purpose of engaging the walls of the perforation 8. The operation of this construction is similar to that of the just described device.

It will be understood that the purpose of the cement, ridges or knurled points, is to provide a means for temporarily holding the base and fastening member in fixed relation, and that other means may be used for accomplishing this end, and the invention is not limited to the specific means herein illustrated.

lVhat I claim is:

1. An insulator for wires comprising a cap and base portion having perforations therethrough, and a fastening member extending through the perforations, provided at the end carrying the cap with an integral head that will not pass through the perforation and at the other end with a point, the said fastening member having means thereon intermediate the point and the head adapted to cooperate with the perforation in the base for holding the base and fastening member in temporary fixed relation, but which is adaptedto be loosened when the fastening member is driven into a support.

An insulator for wires comprising a cap and base portion having perforations therethrough, and a fastening membaextending through the perforations, provided at the end carrying the cap with an integral head that will not pass through the perforation and at the other end with a point, the said fastening member having adhesive means thereon intermediate the point and the head adapted to cooperate with the perforation in the base for holding the base and fastening member in temporary fixed relation, but which is adapted to be loosened when the fastening member is driven into a support.

3. An insulator for wires comprising a cap and base portion having perforations therethrough, and a fastening member extending through the perforations, provided at the end carrying the cap with an integral head that will not pass through the perforation and at the other end with a point, the said fastening member having adhesive means thereon intermediate the point and the head adapted to cooperate with the base for holding the base and fastening member in temporary fixed relation, but which is adapted to be loosened when the fastening member is driven into a support.

JULIAN H. KENDIG.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

